Statistical tests (ANOVA, 0.95 confidence coefficient) indicated that. The coral growth rate at Chong Khat bay and Tao bay was significantly different and Phak Kat bay, no significant difference was found between Tao bay and Phak Kat bay. In near shore areas such as Khang Khao and Lan islands, the growth of coral were at a mean value of 3.9 2.7 cm and 3.8 0.0 cm, respectively